First-Class Mail Delivery Time Calculator (USPS)
The most economical option for sending letters, postcards, and lightweight correspondence. A stamped letter takes 2-5 days by the USPS standard.
By Hamdi Saidani.
Delivery Time (USPS Standard)
2-5 days
Days for a stamped letter (USPS standard)
First-Class Mail Delivery Time Calculator
Enter your ZIP codes to estimate First-Class Mail delivery time for your route.
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Enter the two ZIP codes and the mailing date above, then press "Calculate Delivery Time" to see the expected delivery date for each mail class.
Latest Day to Send First-Class Mail
Know when it has to arrive? Enter the date and get the latest drop-off day, counted back from the delivery days USPS publishes for your ZIP pair.
The day it must be delivered.
First-Class Mail Delivery Times
A stamped First-Class letter takes 2 to 5 days by the USPS standard: usually 2 or 3 in-state and 4 or 5 on most long routes.
Typical Delivery by Distance:
- Same 3-digit ZIP area: 2 or 3 days (4 in 2 of 902 areas)
- Same state: 2-4 days, rarely 5 (2 or 3 on 88% of routes)
- Long distance: 4 or 5 days on most routes
First-Class Mail Pricing & Stamps
Forever Stamp: $0.82 for standard letters. Large envelopes start at $1.69. Postcards: $0.65.
| Mail Type | Price (from July 12, 2026) |
|---|---|
| Forever Stamp (Letter, 1 oz) | $0.82 |
| Additional Ounce | $0.29 |
| Postcard | $0.65 |
| Large Envelope (1 oz) | $1.69 |
| Large Envelope (each extra oz) | $0.29 to $0.31 |
| International Letter (1 oz) | $1.75 |
Forever Stamps Never Expire
Forever Stamps are valid for mailing letters regardless of when they were purchased or future price increases. Stock up to lock in current prices.
First-Class Mail Size & Weight Limits
Letters
- Weight: Up to 3.5 oz
- Length: 5" to 11.5"
- Height: 3.5" to 6.125"
- Thickness: 0.007" to 0.25"
Large Envelopes (Flats)
- Weight: Up to 13 oz
- Length: up to 15"
- Height: up to 12"
- Thickness: up to 0.75" (bigger than a letter in at least one way)
Non-Machinable Surcharge
Letters that are square, rigid, or oddly shaped may incur a $0.49 non-machinable surcharge. Keep letters rectangular and flexible to avoid extra fees.
Letters Go First-Class, Packages Go Ground Advantage
First-Class Mail is for letters, postcards and large envelopes (flats) up to 13 oz. Packages, even light ones, now go by USPS Ground Advantage, which replaced First-Class Package Service in July 2023.
First-Class Letters & Postcards
Standard letters up to 3.5 oz using Forever Stamps. Ideal for personal correspondence, bills, invitations, and documents.
- • From $0.82 (Forever Stamp)
- • 2-5 days (USPS standard)
- • No tracking included
Packages Under 1 lb (Ground Advantage)
Packages under 1 lb now ship as USPS Ground Advantage, which replaced First-Class Package Service in July 2023 and includes tracking.
- • From $7.90 ($8.40 from Oct 4, 2026 to Jan 16, 2027)
- • 2-5 days (USPS standard)
- • Tracking included
First-Class Mail Pros & Cons
- USPS's best-priced service for items up to 13 oz
- Forever stamps never expire
- Works with standard mailboxes
- Good for everyday letters and cards
- No trip to post office needed for letters
- No tracking on standard letters
- Limited weight (3.5 oz letters, 13 oz large envelopes)
- No insurance included
- Longer delivery window
When to Use First-Class Mail
- Personal letters and cards
- Bills and payments
- Legal documents (with Certified Mail add-on)
- Postcards
- Lightweight business correspondence
First-Class Mail Pro Tips
- 1Use Forever stamps to lock in current prices
- 2Add Certified Mail for important documents
- 3Check weight and size to avoid extra postage
- 4Large envelopes are cost-effective for documents
Frequently Asked Questions
How long does First-Class Mail take?
A stamped First-Class letter takes 2 to 5 days by the USPS standard. Mail within your own 3-digit ZIP area is 2 or 3 days in almost every area, in-state mail is usually 2 or 3, and most long routes are 4 or 5.
USPS advertises 1-5 days because some business mail, such as presort First-Class, can have a 1-day standard. Standards are targets, not guarantees.
Is First-Class Mail tracked?
Standard First-Class letters and postcards do not include tracking. You can get a delivery record by adding Certified Mail or Registered Mail; USPS Tracking cannot be bought for a First-Class letter.
Packages go as USPS Ground Advantage, which includes tracking.
How much is a First-Class stamp?
A Forever Stamp for standard First-Class letters (1 oz) costs $0.82 (rate since July 12, 2026). Forever Stamps never expire and are valid regardless of future price increases. Postcards cost $0.65.
What is the weight limit for First-Class Mail?
First-Class letters can weigh up to 3.5 oz. Large envelopes (flats) can weigh up to 13 oz. Packages of any weight go by USPS Ground Advantage or Priority Mail.